Siemens SINAMICS G120XA 1.1kW Frequency Converter

Technical Overview

1.1kW 3-phase 380-440V frequency converter with IP20, 6DI/4DQ/2AI/2AQ, Modbus RTU/BACnet MS/TP/USS, and 97% efficiency for cabinet mounting.

Key Features

State-of-the-art IGBT technology with pulse-width modulation for reliable and flexible motor operation.
Comprehensive protection functions ensuring high safety for both the converter and the motor.
Integrated hardware and software functions designed to increase overall system efficiency and minimize energy consumption.
Flux reduction capability through automatic adaptation of motor current to prevailing load conditions, saving up to 5% under partial load.
Hibernation mode, which allows the converter to enter a low-power state based on process setpoints.
High operational efficiency, reaching up to 97%.
Integrated Fieldbus communication protocols including MODBUS RTU, BACnet MS/TP, and USS.
Optimized user interfaces, such as optional Intelligent Operator Panels (IOP-2) and web server modules, for user-friendly local commissioning and diagnostics.
Designed for secure and protected installation within a control cabinet.
Equipped with 6 Standard Digital Inputs, 4 Digital Outputs (relay changeover contact), 2 Analog Inputs (differential), 2 Analog Outputs (non-isolated), and 1 Motor Temperature Sensor Input.
Overload capability of 110% of base load current (IL) for 60 seconds within a 600-second cycle time.

Technical Specification Matrix

Parameter	Value
Rated Power	1.1 kW
Input Number of Phases	3 AC
Input Line Voltage	380 ... 440 V (+10% / -20%)
Input Line Frequency	47 ... 63 Hz
Input Rated Current (LO)	2.10 A
Output Number of Phases	3 AC
Output Rated Voltage	400 V
IP Protection Rating	IP20
Frame Size	FSA
Integrated Fieldbus	MODBUS RTU, BACnet MS/TP, USS
Standard Digital Inputs	6
Digital Outputs (relay changeover contact)	4 (DC 30 V, 1.0 A resistive load)
Analog Inputs	2 (Differential input, 12 bit resolution)
Analog Outputs	2 (Non-isolated output)
Motor Temperature Sensor Input	1 (PTC, KTY, PT1000, Thermo-Click compatible)
Filter Class (integrated)	Unfiltered
Efficiency η	0.97 (97%)
Power Factor λ	0.75 ... 0.93
Power Factor cos φ	0.99
Sound Pressure Level (1m)	63 dB
Overload Capability (Low Overload LO)	110% base load current IL for 60 s in a 600 s cycle time
Output Frequency for Vector Control	0 ... 240 Hz
Output Frequency for V/f Control	0 ... 550 Hz
Pulse Frequency	4 kHz
Physical Weight (kg)	3.1
Dimensions L x W x H (cm)	20.9 x 7.3 x 23.2

Industrial Applications

1. HVAC System Fan/Pump Control

This SINAMICS G120XA inverter is ideal for controlling variable speed pumps and fans in commercial or industrial HVAC systems. Its 1.1kW power rating suits smaller to medium loads, while integrated BACnet MS/TP communication allows seamless integration with Building Management Systems (BMS). The high efficiency of 97% and flux reduction features ensure energy savings for demand-controlled ventilation and pumping.

Problem Solved

Optimizes energy consumption and enables precise control of air/water flow, reducing operational costs and improving comfort by matching motor speed to actual demand, preventing continuous full-speed operation.

Variable Frequency Drive (VFD)HVACBMS IntegrationBACnet MS/TPPump ControlFan ControlEnergy Efficiency

2. Small Water Treatment & Wastewater Pumping

Suitable for controlling small pumps in water treatment plants or remote wastewater pumping stations. The IP20 rating mandates installation within a protective control cabinet. Modbus RTU communication facilitates integration with SCADA or PLC systems for remote monitoring and control of water levels and flow rates. Its 110% overload capability for 60 seconds handles transient load increases, such as during pump start-up or minor blockages.

Problem Solved

Provides precise flow and pressure regulation in water management, mitigating water hammer and reducing mechanical stress on pumping infrastructure, thereby extending equipment lifespan and ensuring stable process operation.

Pump ControlWater TreatmentWastewaterModbus RTUSCADA IntegrationFlow ControlPressure Regulation

3. Light-Duty Conveyor System Control

The 1.1kW power output and variable speed capabilities make this inverter excellent for light-duty conveyor belts in packaging, logistics, or assembly lines. Precise speed variation enables flexible production rates and smooth acceleration/deceleration, minimizing mechanical wear. Digital I/O facilitates easy integration with control logic for start/stop commands, speed references, and fault signaling, while the motor temperature sensor input enhances motor protection.

Problem Solved

Enables optimized throughput, minimizes product damage during starts/stops, and reduces mechanical wear on conveyor systems, leading to higher operational efficiency and reduced maintenance requirements.

Conveyor BeltMaterial HandlingVariable Speed DriveMotor ControlDigital I/OProduction LineSoft Start/Stop